What is the AATCC 100 Test?

AATCC (American Association of Textile Chemists and Colorists) tests are standardized methods used in the textile industry to evaluate and measure material properties. These test methods ™ cover many variables — colorfastness, durability and performance as well as physical and chemical characteristics. 

AATC TM100 — last revised in 2019 with updated parameter definitions — is a test that focuses on how well a material is able to fight bacteria.

What’s the Purpose of the AATCC TM100

AATCC Test Method 100 is a quantitative assessment of how well a textile material finish is able to stand up to antibacterial activity in accordance with its intended use. It looks at both bacteriostatic (bacteria stopping) and bactericidal (bacteria killing) activity, offering detailed measurements that allow for continuity and replicable results. Standard microorganisms tested are Staphylococcus aureus and Klebsiella pneumonia but additional testing can be done for particular fungus and bacteria.

Stages of the AATCC 100 Test Method 

• Preparation of samples. The test microorganism is grown within a liquid culture.

• Sterilization. Concentration of the test microorganism is standardized and the microbial culture becomes diluted in a sterile nutritive solution.

• Inoculation. Swatches of fabric — control and test — are inoculated with the microorganism.

• Incubation. Growth occurs.

• Washing and shaking out. Fabrics are washed. 
• Counting. Reduction of microorganisms in comparison to initial determinations is calculated.

Need to talk to someone about your antimicrobial testing needs? Contact a NAMSA representative.